SAMOP 2021 – scientific programme
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A: Fachverband Atomphysik
A 6: Atomic systems in external fields
A 6.3: Poster
Tuesday, September 21, 2021, 16:30–18:30, P
Free electron vortices meet optical vortex beams: Analogies and Differences — •Darius Köhnke1, Kevin Eickhoff1, Lea-Christin Feld1, Stefanie Kerbstadt1,2, Lars Englert1, Tim Bayer1, and Matthias Wollenhaupt1 — 1Carl von Ossietzky Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, D-26129 Oldenburg, Germany — 2Center for Free-Electron Laser Science (CFEL), Deutsches Elektronen Synchrotron DESY, Notkestraße 85, D-22607 Hamburg, Germany
In recent years, vortex states have attracted significant interest in various fields of physics ranging from fundamental studies of light-matter interaction to advanced optical applications. Here, we present a comparative study of free electron vortices created by atomic multiphoton ionization and optical vortex beams generated with a holographic technique. On the one hand we use spectral pulse shaping to generate polarization-tailored carrier-envelope phase stable bichromatic laser pulses creating photoelectron vortices. On the other hand we employ computer generated holograms for spatial tailoring of a laser beam forming optical vortex beams. While both methods can be interpreted as an advanced double slit experiment in either the spectral or spatial domain, the resulting topological properties of the vortex states are quite different. We discuss the different topological properties as well as their manipulation. Further we demonstrate control of the symmetry and orientation of the vortex states in both scenarios.